A pair of sisters visiting a Melbourne, Australia, zoo left with the ultimate souvenir: a one-of-a-kind snapshot with a very photogenic gorilla.

Standing behind the enclosure's glass, Motaba, a 29-year-old resident of the Werribee Open Range Zoo, photobombs 6-year-old Ella O'Brien and 4-year-old Bridget in a picture that could put a camera-ready stingray to shame.

The youngsters keep their cool in the now-viral photo, seemingly unaware that there's an incredibly large – and presumably hungry – animal behind them.